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FT-991 O
peraTing
M
anual
ipo
(
i
ntercept
p
oint
o
ptiMizAtion
)
The IPO feature allows the operator to optimize the characteristics of the receiver front end, depending on the current
noise level and the strength of incoming signals.
Touch [
IPO
] displayed by pressing the
F(M-LIST)
but-
ton repeatedly, to set the desired characteristic of the
receiver front end, according to the chart below.
AMP1
: Amplifies the incoming signals, using a low
distortion RF preamplifier (gain: approx. 10
dB).
AMP2
: Amplifies the incoming signals, using a
2-stage low-distortion RF preamplifier (total
gain: approx. 20 dB).
IPO
: Bypasses the RF preamplifier, yielding direct
feed to the first mixer.
The selected receiver RF preamplifier will be indicated
in the IPO column of the Key Function Display on the
TFT display.
A
dvice
:
On the 10 MHz and lower bands, it generally is not
necessary to use any preamplifier at all; selecting the
“IPO” position as described above will increase the
strong-signal-handling capability of the receiver, and
generally will result in more pleasant reception due
to reduced noise. If you can hear band noise with the
preamplifiers disengaged, then a preamplifier is gen
-
erally not needed.
i
nTerferenCe
r
eJeCTion
F(M-LIST) Button
Summary of Contents for FT-991
Page 2: ......
